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AFS Securities (AFS securities with gross unrealized losses) (Details)
$ in Thousands
Jun. 30, 2023
USD ($)
Securities
Dec. 31, 2022
USD ($)
Securities
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months $ 3,907 $ 19,424
Fair Value, Less Than Twelve Months 86,055 306,799
Gross Unrealized Losses, Twelve Months or More 41,069 26,092
Fair Value, Twelve Months or More 404,543 244,918
Total Unrealized Losses $ 44,976 $ 45,516
Number of Securities in an unrealized loss position, Less Than Twelve Months, Fair Value | Securities 62 178
Number of Securities in an unrealized loss position, Twelve Months or More, Fair Value | Securities 225 266
Number of Securities in an unrealized loss position, Total Unrealized Losses | Securities 287 444
States and political subdivisions [Member]    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months $ 242 $ 2,389
Fair Value, Less Than Twelve Months 16,972 48,083
Gross Unrealized Losses, Twelve Months or More 4,504 2,514
Fair Value, Twelve Months or More 38,371 40,667
Total Unrealized Losses 4,746 4,903
Auction rate money market preferred [Member]    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 0 0
Fair Value, Less Than Twelve Months 0 0
Gross Unrealized Losses, Twelve Months or More 563 858
Fair Value, Twelve Months or More 2,637 2,342
Total Unrealized Losses 563 858
Collateralized mortgage obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 3,597 12,408
Fair Value, Less Than Twelve Months 67,725 201,315
Gross Unrealized Losses, Twelve Months or More 9,390 165
Fair Value, Twelve Months or More 113,271 4,411
Total Unrealized Losses 12,987 12,573
US Treasury Securities    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 0 1,388
Fair Value, Less Than Twelve Months 0 18,331
Gross Unrealized Losses, Twelve Months or More 22,068 21,533
Fair Value, Twelve Months or More 209,353 190,370
Total Unrealized Losses 22,068 22,921
Corporate Debt Securities    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 0 0
Fair Value, Less Than Twelve Months 0 0
Gross Unrealized Losses, Twelve Months or More 1,413 1,022
Fair Value, Twelve Months or More 6,737 7,128
Total Unrealized Losses 1,413 1,022
Mortgage Backed Securities, Other [Member]    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 68 3,239
Fair Value, Less Than Twelve Months 1,358 39,070
Gross Unrealized Losses, Twelve Months or More 3,131 0
Fair Value, Twelve Months or More 34,174 0
Total Unrealized Losses $ 3,199 $ 3,239